687202261261 has 2 divisors, whose sum is σ = 687202261262. Its totient is φ = 687202261260.

The previous prime is 687202261223. The next prime is 687202261289. The reversal of 687202261261 is 162162202786.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409664002500 + 277538258761 = 640050^2 + 526819^2 .

It is a cyclic number.

It is not a de Polignac number, because 687202261261 - 2¹¹ = 687202259213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687202261211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343601130630 + 343601130631.

It is an arithmetic number, because the mean of its divisors is an integer number (343601130631).

Almost surely, 2^687202261261 is an apocalyptic number.

It is an amenable number.

687202261261 is a deficient number, since it is larger than the sum of its proper divisors (1).

687202261261 is an equidigital number, since it uses as much as digits as its factorization.

687202261261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 687202261261 in words is "six hundred eighty-seven billion, two hundred two million, two hundred sixty-one thousand, two hundred sixty-one".